Haste Shader V1.1.4 V53 — Event-horizon occlusion + End starfield

Black hole:
- Removed the near-side override that let the direct accretion disk draw across the black shadow.
- Applied the event-horizon shadow mask to both direct emission and lensed emission.
- Moved the lensed-flow cutoff just outside the horizon so the center remains uninterrupted black.
- Preserved black-hole scale, world-pinned direction, disk animation and broad glow.

End stars:
- Reworked star populations with slight density clustering, varied sizes and restrained stellar temperatures.
- Added faint stellar aureoles and rare, fine diffraction glints for the brightest stars.
- Kept all star positions world-pinned and the existing End nebula unchanged.

Validation:
- ZIP structure and source-level delimiter checks performed.
- Not compiled or tested inside Minecraft; in-game verification is still required.
